ENERGY DETERMINATION OF HEAVY-ION BEAMS

The energy calibration of the beam analyzing magnet at the 4 MV Dynamitron tandem accelerator in Bochum has been carried out over a wide magnetic field range (B=2.4-12.4 kG) using the well-known energies of several proton induced resonance reactions. The roles of projectile and target nuclei have been exchanged in these reactions, i.e. a hydrogen gas target has been bombarded with the corresponding heavy ions. In this way, the necessary high energies of the heavy ion beams were accurately defined and used in the calibration of the beam analyzing magnet at high field strengths. For the field range investigated, the magnet calibration factor K was observed to be constant within experimental uncertainties (ΔK=±0.2%). Atomic effects in the measurement of nuclear energies are discussed. © 1979.